Write vtk file from mha volume input

Development
1

Hi

I have a little question on vtk development

My input file is mha volume

char volume_i[50];
char reader_i[50];
char writerVTK_i[50];
char out_file[50];


      sprintf(volume_i, "\nVolume %d", i);  
        printf("%s : %s \n", volume_i, argv[1]);

        vtkSmartPointer<vtkImageData> volume_i = vtkSmartPointer<vtkImageData>::New();

        sprintf(reader_i, "Reader %d", i); 

        vtkSmartPointer<vtkMetaImageReader> reader_i = vtkSmartPointer<vtkMetaImageReader>::New();

        reader_i->SetFileName(argv[1]);
        reader_i->Update();

        volume_i->DeepCopy(reader_i->GetOutput());

I would like to write vtk file as an output.

I tried this code :

vtkSmartPointer<vtkPolyDataWriter> writerVTK_i = vtkSmartPointer<vtkPolyDataWriter>::New();

sprintf(out_file, "%d.vtk", i);  
printf("%s\n", out_file);
writerVTK_i->SetFileName(out_file);
writerVTK_i->SetInputConnection(volume_i->GetOutputPort());
writerVTK_i->Write();

Should I use vtkMetaImageWriter ?

Thank you